Wilkinson Microwave Anisotropy Probe DR4
The data made available through this page has been updated. The most recent version of this data may be accessed through https://lambda.gsfc.nasa.gov/product/wmap/current/"
DR4 Point Source Catalog
This is a catalog of 471 point sources detected in the seven year WMAP skymaps independently from any previous surveys. The sources listed inthe catalog were detected as ≥ 5 sigma peaks in WMAP maps thathave been weighted by the square root of the number of observationsand optimally filtered for point source detection. The position ofeach source is obtained by fitting a Gaussian profile plus abaseline to each detected peak. Of the 471 detected sources, 444have one or more possible 5 GHz counterparts. Of the sources withno 5 GHz identification, some are close to the detection threshold and may be spurious. The catalog lists the following parameters foreach source:
The CMB-free method identifies 417 point sources in a linear combination mapformed from Q, V, and W band maps using weights such that CMB fluctuationsare removed and flat-spectrum point sources are retained. Source fluxesare then estimated by integrating the Q, V, and W temperature maps within1.25 degrees of each source position and applying a correction for Eddingtonbias due to noise. The catalog lists the following parameters foreach source: